The art of leaf painting, which radically breaks the traditional painting pattern of “drawing in square” and establishes the visual effect concept of “circle inside, square outside, combining them as wholeness”, is the mystique discovered by Mr.Liu who studied and created the “theory of square and circle” in the 20^th century. The art with the perfect combination between leaf and painting leads people entering into the three-dimension world. Fully taking the advantage of leaf’s shape, color, vein, stem, fold and disrepair to form a picture, leaf painting is the masterwork jointly made by nature and humanity and can be praised as the art embodying “coming back to Mother Nature” and “integration of university and humanity”.